Google wanted a platform that prevented Microsoft and Apple from beating them to control of the next big advertising platform.
Nothing more, nothing less. "Open" has been shown conclusively to take a back seat to monetization. It is as much a marketing tactic (in the sense that it's useful to promote the platform, but can and will be discarded, with spin to explain why, when its usefulness decreases) as anything in Microsoft's or Apple's ads.
And it doesn't matter how you try to downplay it: companies other than Google have, whether they intended to or not, accomplished undeniable good through things they've shipped. Apple, for example, has contributed monumentally to LLVM, which is a large and useful public good. But it did so more or less explicitly to screw the GPL.
So, faced with all the major players doing this in some form or another, how, precisely, do you plan to rank them relative to each other in order to discern which one is "good" or at least "least bad"?